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Patented sept. 7,1920.

3 SHEETS-SEET l.

L`. L. KNOX.

REVERSING FURNACE.

APPLICATION FILED n;c. 2|. 191s.

HMH.

WITNESSES L. L. KNOX.

REVERSING FURNACE.

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M. 1 MMAU @www WITNESSES understood by reference tothe accompany UNITED STATES LUTHER. L. KNOX, orAvALoN, PENNSYLVANIA, Assicfivon` To BLAw-KNOX COMPANY,

PATENT' oFgFicE.

OF PITTSBURGH, ENNSYLVANIA, A CORPORATION NEW JERSEY.

RnvnnsiNG-FURNACE.

To all whom t may concern.'

Be it knownvthat [,`LUTH'ER3L. KNOX, a citizen of the United States, residing at Avalon, Allegheny county, Pennsylvania, have inventedY a new and useful Improve-` ment in Reversing-Furnaces, of which the following is a full, clear, and exact Vdescrip-v tion, reference being khad to the accompanying drawings,y forming part of this specification, in which: f

Figure 1 is ra plan view of ayvalve system embodying my invention, showing the several fines controlled bythe valves iny My invention has relation to avalve vsystein for reversing regenerative furnaces, and Y Vis designedto provide a system of' this character in which the several air-and gas valvesl are mechanically actuated by means of ino-KY tors, each motor operating one set of valves, and whereby,` bv proper control of the motors, the valves may be operated incer-A tain predetermined. time relations. A fur* ther object of the invention is to providea system of this character in whichthe actuating connevcti'ons forthe gas inlet control valves and the gas and air reversing valves are provided with means whereby the valves of each set may be operated in apredeter-Y mined relation. y f f The natureof my invention will -be ybesty ing drawings, in which I have shown preferred embodimentthereof, and which will now be described, it being premised, however, that various changes can begmade in the details of construction land arrangement of the parts without departing from the Yspirit and scope of my inventiony asset forth in the appended claims.

In these vdrawings rthe opposite end of the.. furnace. 8, isan airre-k i speifition of Letters Patent.

of the valve sys? relevation of'one ofthemotors and its gear connections. v

numeral r'2 desigrk nates the gas regenerator `at one end of the Y furnace, and 2t the gas regenerator at the x Patented sept. 7, i920.

Application filed December 21, 1916. rSerial No.. 138.2859.

generator at onek end, and 3a a similar regenerator at the opposite end. 1 designates a gas inlet flue leading to the regenerator 2 and 1a a gas inletliue .leading to the regen-l l erator 2a. 5 designates the air inlet flue for the regenerator 3, and .5a. the corresponding air inlet flue for theregenerator 3a. 6is the gas inletcontrol valve for thefiiue and 62H I the similar valve lfor the flue 1a. 7 isa gas reversing valve placedin a flue 8 leading to stack lue 9; and 7a is a similar gas reversing valve placed in' a flue 8a also leading to the :stack connection 9-' 1Y0 is the vair inlet for the line 5&1.V llisthe air reversing valve yfor the flue 5, and 11EL a similar valve for the y f 4 flue 5a. IIL-III of shown as'being of the damper 'type and are` 1 Thevalves 6, r6, 7,i7a,iand 11, 115 are preferably setso as toseat obliquely across their respective flues. The air inlet valves 10 and 10a are shown as being of the muslirooin type and provided withseatsat the. kmouths ofthe respective air inlets.v -The particular character and details Vof construction of the severalvalves form no part whatever of the present invention. Y 12 designates` an electric -motor thereon a double pull'eyffl (see Figs. 1, 3

`and Connectedto oneimember .of the pulley 15 .at one end is a cable 16 which ex- .i valve for the l'lue 5, and 1()a a similar valve l n Y Whose armature shaft is connected through suitL fable gearing 13 with a shaft 14, .f having tends over suitable ,guidepulleys 17 and tlience downwardly, being connected vat' its opposite end to the air reversing valve 11.v

A similar cable 16?L is connected to the other member of the pulley 15 and extends thence lover ythe guide rpulleys 17a and is connected Y` at its'otherend to the air4 reversing valvef11 rHung from the Vcable llbetween the pulleys.

15 and 17 is a movable counterweight 18;

and 18a is a similar counterweivht hun@ on the cable 16a. The shaft 111 also carries two pulleys 19 and 19a. Connecte'dto the pulley f `19 yat* one end is a cable 2O) which extends over a guide pulley 21= and thence downwardly and is connected to' a weighted yolre 22owhich has aA sliding lost motion connec-k I tionv withtlie headed stem"23 of theV air inlet valve 10.k k20ais similar cable connected at one end to the pulley 19a`r and thence passing over aA guide pulley 21a and n being connected to the stein 23ai of the valvey respondingair reversing valve 11 tive gas inlet control valves 6 and 6.

10 through the medium of the yoke 22'?!` Each guide pulley 21, 21a is mounted on a of each of these valves so that by actuating the screw 26 or 26EL the valve 10 or 16 may be set to a position in which it will remain seated, irrespective of the position of the co1'- or 11, as may be desirable in blowing out the flues.

y 2.7 is a second electric motor which is connected by gearing 23 (similar to that'described in connection with motor 12) with a double pulley 29. rl`his pulley is connectedby the oppositely winding and extending cables 30 and 301 with therespective gas reversing valves 7 and 7a. 31, 31 designate suitable guide pulleys for these cables 36 and 30a. Each of these cables is also provided with a suspended movable counterweight 32 or 32a, similar to the counterweights 18 and 18a before described.

33 designates a'third electric motor which is connected by gearing 34 with a shaft carrying a double pulley 35. This pulley 35 is connected by oppositely winding and extending Ycables 36 and 36 with the respec- 37 and 37a designate guide pulleys for the cables 36, 36-, 38 and 38a designate suspended counterweights for the cables 36 and36a,A

these beine similar to the counterweights for 'the other cables before described.

The shafts of the main guide pulleys 17, 17a, 31, 31a, and 37, 3T are'each provided with another pulley 39; and connected to each pulley 39 is a cable 40 which extends upwardly over a guide pulley 41 and thence downwardly to a counterweight e2. .The

' end portion of each cable l.l0 is provided with adjustablestops 43 for engagement with the lever arm 44: of an electric switch device L15, this switch being suitably 'connected with the circuit of the electric motor which controls the particular valve, the movement of which actuates the cable 40. T ie purpose of these limit switches is to automatically stop the motor after the desired amount of movement of the valve. Each counter-weight L12 is also provided with an indicator 46. These indicators provide means whereby the operator can, at a glance, determine the position of each of the valves.

The operation of the reversing valves will be readily understood. It will be seen that when eachmotor is actuated one set of *l e damper valves will be operated to open one yfirst closed.

valve and close the other; and that the operation of the motor 12 will also eiiect the opening of one of the air inlet valves and the closing of the other air inlet valve. By reason of the counterweights withv which the actuating connections for the damper valves are provided it will be readily seen that each motor will operate to close one of the damper valves actuated by it, or substantially close it, before the other damper valve of that set will start to open. Thus, considering the valves 11 and 11'?L in Fig. 3, it will readily be seen that the operation of the pulley 15 will immediately sla-cir the cable 16 to permit the valve 11 to close; but that before the valve 11a can start to open, the counterweight 181L on the cable 16a must be raised all the slack on which said counterweight hangs be taken up.

lt will therefore be apparent that at each reversal the air and gas controllingvalves for one end of the furnace, together with the gas inlet control valve 'for that end of the furnace, will be closed before the corresponding valves for the opposite end or the furnace start to open. This arrangement is designed to reduce to a minimum the loss of gas at each reversal.

The several motors may be operated in any predetermined time relation by suitable connections and switches, such a system of operation being described and claimed in my pending application Serial No. 108,130, led March 10, 1916.

For instance, supposing the valves to be in the positionslshown in Figs. 1, 2 and 3, and the valves 6a and 10"L are open, and the lvalves 7a and 11 are closed at one end of the furnace, while at the other end of the furnace valves 6 and 10 are closed and Vvalves 7 and 11 are open, and it is desired to reverse the furnace, this is preferably accomplished as follows: The valve 6a is After a proper time interval the valves 7a and 11a will be opened and the valve 1Ga will be closed. Valve 10 will be opened at about the time that valve 10 is closed. rlhere will be a time interval between the opening of valve 7a and the closing of valve 7, and valve 6 will be the last toopen. In this manner, any gas trappedA between the valve 6a and the furnace at the time valve 6n is closed, will be burned before the reversal is eil'ected.

My invention provides a valve operating system in which the worlr of reversing the valves is positively and reliably performed by means of power motors. By means of the described indicators, the operator can atonce detect any failure of any valve to properly operate from any cause.

It will be readily understood that the details of construction and arrangement of the various actuating connections, as well as the construction and character of the valves themselves, may be Widely varied Within the spirit and scope of my invention as `defined in the claims.

I claim:

l. A valve system for furnaces, comprising a pair of air-inlet-valves, a pair or" air reversing valves, a pair of gas inletvalves,

and a pair of gas-reversing valves, a motor having actuating connections With the `air motor for the gas inlet valves, anda ythird motor for the gas-reversing valves, said mo-' tors being arranged for independent actuation; substantially as described.

2. A valve system for furnaces, lcomprising a pair of air-inletvalves, a pair of air reversing valves, a pair of gas inlet yvalves,`

y and a pair of gas-reversing valves, anlotor having actuating connections ywith the air inlet and the air reversing valves, a second` motor for the gas inlet valves, and a third motor for the gas-reversing valves, saidr motors being arranged for independent actua# tion, the actuating connections between each motor and the pair or pairs'of valves con-y trolled thereby being arranged'to move one valve of each pair in advance of and infthe Areverse direction to the otherone of `the `particular pair; substantially as described. 3. A valve system for furnaces, comprising a pair 'of air-inlet-valves, a pair of air reversing valves,*a pair of gas inlet valves, and a pair of gas-reversingvalves, a motor having actuating connections with the airr inletfand the air reversing valves, a second .motorfor the gas inlet valves, and a third inlet and the air reversing valves, agsecond motor for the gas-'reversing valves, said. motors being arranged for independent actuation, the actuating connections betweeneach motor and the pair or pairs of valves controlled'thereby being arranged Vto move one s valve of eachpair in advance of and in the reverse direction to the other one of the particular pair, together .With means actuated by said connections for indicating the posi! In testimony whereof,

Witnesses: j

`Grao. H. PARMELEE, M. CoRWiN.

tionof a number or' the said valves, sub-v fstantially als described.. s

LUTHER L. KNOX. f 

